Durable material: The 7-step ruler is made of sturdy clear PVC, which is wear-resistant, waterproof and easy to clean, and can maintain its clarity and functionality after long-term use in harsh environments
Transparent design: Made in an ID-sized transparent format, it can fit seamlessly into a badge holder, pocket or tool bag for easy use
Versatile tool: Perfect for students, cardiology technicians, nurses and clinicians of all experience levels, this tool is a must-have tool for education and practice
Easy to carry: Small size, perfect size, can be put into your ID card holder for easy storage and access, designed for the 7-step interpretation method
Easy to read reference: Clear millimeter scale ensures accuracy of analysis, transparent ID-sized card makes interpretation simple